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Long afterglow luminescent material with compounded substrates and its preparation method

a technology of luminescent materials and substrates, applied in the field of compounded substrates long afterglow luminescent materials, can solve the problems of poor phototability and short lifetime, inability to meet the needs, and short afterglow time of sulfuric acid, and achieve excellent water resistance, high brightness, and uniform particle size

Inactive Publication Date: 2009-01-15
SICHUAN SUNFOR LIGHT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]The phosphorescent material sintered body with loose blocks can be obtained by cooling the sintered phosphorescent material in air. The phosphorescent material powder with uniform particle size (fineness can attain nanometer scale) can be obtained by the jaw crusher, crush roller, jet mill, ultrasonic vibrating screen. Then the surface of the obtained product is further processed by the surface coated treatment with the 0.1-2% concentration (weight) of ethyl orthosilicate or methyl silicone oil whereby the high brightness, ultra-long after-glow in the present invention and luminescent powders with uniform particle size and excellent water resistance can be obtained.
[0024]Compared with the conventional methods, the luminescent material in accordance with the present invention is of loose blocks, easy to be comminuted and the obtained product has a uniform particle size. In addition, the product has the good property excited by faint light, high luminescence brightness and after-glow lasted for a long time. Moreover, the product in the present invention is of good water resistance and has strong practicality.
[0025]The ultra-long after-glow phosphorescent material in the present invention is a composite substrate inorganic luminescent material with superior luminescent property to that of the phosphorescent material based on aluminate substrate. This phosphorescent material has polyhedron crystal lattice and can be excited quickly under faint light (1-3 seconds). In addition, the obtained composite long after-glow phosphorescent material as substrate with a very small particle size (such as nanometer scale) still has high brightness, ultra-long after-glow properties. And also such material has excellent water resistance property. In addition, the ultra-long after-glow multi substrate phosphorescent material in present invention also has good heat resistance, which can be combined with ceramic materials and calcified at 500-1000° C. to produce a luminescent ceramic article with insusceptible luminescence brightness.

Problems solved by technology

This kind of sulfide with very short after-glow time, instable properties, poor photostability and short lifetime, however, should not be used outdoors basically.
Even used for a clock panel, it cannot meet the needs due to only 20-30 minutes in after-glow time.
But the radioactive material is an acknowledged dangerous pollution source.
It will have serious damage for human body and environment.
JP8-73845, JP8-127772 shows higher brightness and longer after-glow time, however, the sintering blocks are difficult to be broken, resulting in great depression of the powder brightness due to excessive high sintering temperature, or high sintering temperature reduced by introduced excessive boric acid.
At the same time, because the N2+H2 gas mixture is used, the operational security is not good and equipment difficulty is increased.
Also the requirement for heating becomes stricter due to excessive high sintering temperature, consequently the cost is increased.
But as described above, the problems, such as high temperature during its production process, high hardness of the product bulk, difficult to be broken have always perplexed people.
However, the fluorescence brightness and water resistance of the obtained product still can not meet the needs for long-term storage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Raw Materials

[0028]

rawdosagedosagerawdosagedosagematerial(g)(mol)material(Kg)(mol)SrCO357.8Kg0.3915Al2O337.6Kg0.5013Eu2O32.8Kg0.008Dy2O33.1Kg0.0083H3BO33.7Kg0.0599S1.7Kg0.05431P2O56.4Kg0.0451LiCl0.7Kg0.0163Urea0.5Kg0.0083Ce2O30.7Kg0.0021MnCO30.5Kg0.0044SiO212Kg0.1997

Method:

[0029]Materials with above ratio are mixed thoroughly, then put in a corundum crucible and introduced into NH3 gas at 1450° C., and then calcined for 1.5 hours in this environment. Then, the obtained materials are ground to the size of 10-50 um by the jet mill to obtain the luminescent powder. The general formula of the product generally is:

0.05431SrS.0.027 Sr3(PO4)2.0.1997 SrSiO2.0.3915SrO.0.5013Al2O3.0.008EuO.0.0083Dy2O3.0.0021Ce2O3.0.0044MnO  (1)

[0030]The obtained luminescent powders are put into the solution with ethyl orthosilicate:ethanol=100:2, stirred thoroughly and dried at 200° C., sieved to obtain phosphorescent material with excellent water resistance, high initial-brightness and long-time after-glow. ...

example 2

Raw Materials

[0031]

rawdosagedosagerawdosagedosagematerial(g)(mol)material(Kg)(mol)SrCO356.20.3807Al2O3320.3137Eu2O32.20.00625Dy2O32.70.00723H3BO33.20.0517S3.20.1P2O550.0352LiCl0.40.0094Urea0.20.003Ce2O30.50.00152MnCO30.60.00174SiO290.149

Method:

[0032]The method in the example 1 is repeated except that the calcination is performed at 1400° C. for two hours. The general formula of thus obtained luminescent powder generally is:

0.1SrS.0.0176Sr3(PO4)2.0.149SrSiO2.0.3807SrO.0.3137Al2O3.0.0625EuO.0.00723.Dy2O3.0.00152Ce2O3.0.00174MnO  (2)

[0033]The further process with ethyl orthosilicate:ethanol=100:2 in the same manner as Example 1 is performed.

[0034]The obtained product with the emission peak 530 nm is yellow-green illuminant. When excited by 200 LX light source, the time that the brightness is reduced to 0.32 mcd / m2 is 66 h. Main properties compared with the known products are listed in Table 1.

example 3

Raw Materials

[0035]

rawdosagedosagerawdosagedosagematerial(g)(mol)material(Kg)(mol)SrCO357.50.3895Al2O3370.3627Eu2O31.980.0056Dy2O32.650.0071H3BO340.0647S140.4375P2O580.05635LiCl0.350.00825Urea0.50.008Ce2O30.50.001513MnCO30.60.00522SiO270.1165

Method:

[0036]The method in the Example 1 is repeated except that the calcination is performed at 1400° C. for three hours. The general formula of the obtained luminescent powder generally is:

0.4375SrS.0.02817Sr3(PO4)2.0.0582SrSiO2.0.3895SrO.0.3627Al2O3.0.0056EuO.0.0071Dy2O3.0.001513Ce2O3.0.00522MnO  (3)

[0037]The further process with ethyl orthosilicate:ethanol=100:2 in the same manner as Example 1 is performed.

[0038]The obtained product with the emission peak 530 nm is yellow-green illuminant. When excited by 200 LX light source, the time that the brightness is reduced to 0.32 mcd / m2 is 65 h. Main properties compared with the known products list in Table 1.

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PUM

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Abstract

The present invention provides a new ultra-long after-glow phosphorescent material and manufacturing method for the same. The said materials include a phosphor including aMS.bM3(PO4)2.cMSiO2.dMO.fAl2O3.xRO.yTR2O3.zMnO, where the M is Ca, Mg, Ba, Sr, Zn or combinations thereof, The R is Eu, Sm, Yb, Pr and Nd or combinations thereof; the TR is La, Y, Nd, Dy, Er, Tu, Ce, Ho or combinations thereof; and a, b, c, d, f x, y, z is the number of mol. The phosphorescent material has superior water resistance and temperature resistance.

Description

FIELD OF INVENTION[0001]The present invention relates to a composite long after-glow phosphorescent material as substrate and manufacturing method for the same, particularly to an ultra-long after-glow phosphorescent material with high water resistance and high brightness.DESCRIPTION OF RELATED ART[0002]The long after-glow phosphorescent material is a kind of material irradiated by sunlight or other light source, such as ZnS:Cu (green light emitting) or CaS:Bi (purple-blue light emitting) or ZnCdS:Cu (yellow-orange light emitting). This kind of sulfide with very short after-glow time, instable properties, poor photostability and short lifetime, however, should not be used outdoors basically. Even used for a clock panel, it cannot meet the needs due to only 20-30 minutes in after-glow time.[0003]Another light-storage phosphor developed in the past contains a radioactive material, which can be self-luminous for a long time. But the radioactive material is an acknowledged dangerous pol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K11/78
CPCC04B35/447C09K11/7796C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3262C04B2235/3284C04B2235/3409C04B2235/3418C04B2235/446C04B2235/9661C04B2235/9669C09K11/7778C04B2235/3201
Inventor ZHANG, MINGZHANG, LIZHANG, XIAOLEIZHANG, QIANG
Owner SICHUAN SUNFOR LIGHT
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